On Nov. 16, 2001 — exactly 15 years ago on this day — a phenomenon was born: Harry Potter and the Sorcerer’s Stone, the first film adaptation of the bestselling book series by J.K. Rowling, was released in theaters and became a household name overnight.

In honor of the anniversary, and the upcoming spinoff, Fantastic Beasts and Where to Find Them, Yahoo Movies set out to find the biggest — and we mean biggest — Harry Potter super-duper fan we could find. The answer is right up there, in the video above. Her name is Katie Aiani.

Aiani’s Harry Potter obsession started when she was about 11 years old, and from there, she eventually became a full-fledged Potterhead. She started going to midnight movie premieres and fan conventions all over the world, and her latest obsession is going to Harry Potter Wizarding World at Universal Studios about three times a week.

From all the movie posters…

Aiani’s movie poster collection.

To collecting the first book in different languages…

Harry Potter books in different languages.

To toy figurines…

Aiani’s figurine collection.

Aiani’s memorabilia collection consists of more than 3,000 items.

Aiani was so inspired, she eventually wrote a letter to J.K. Rowling about her life story. Rowling then did the unthinkable — she wrote back. From there, Aiani did what the ultimate Harry Potter super-duper fan would do: She got one of Rowling’s inspirational quotes from the letter, immortalized on her arm. The tattoo reads: “Keep fighting. You’re inspirational. With love and admiration, Jo.”

Aiani’s J.K. Rowling tattoo on her arm.

But the biggest thing Harry Potter has done for Aiani was teach her to give back to the world. Aiani, along with her friend Isaac Pierce, started a nonprofit called Nerder Mysteries, in which Aiani and Pierce produce family-friendly nerd-themed murder mysteries whose proceeds go to charity.

If you too, are a Super Duper Fan, let us know your story on Facebook, or in the comments below!

Did you know that Eddie Redmayne was unaware Fantastic Beasts and Where to Find Them would be a five-movie franchise? For even more Harry Potter news, watch the video below: